Instructional Video

Completing the Square with Complex Roots

Curated and Reviewed by Lesson Planet

Explore completing the square as a process for finding complex roots of quadratic equations with a video lesson that pulls together several concepts related to quadratic equations. The example shows how to complete the square with a quadratic equation and then solve using a square root of a negative number. The answer results in a complex solution.

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CCSS: Adaptable
Additional Tags
Instructional Ideas
  • Use the lesson as an extension for upper-level pupils
  • Begin with examples that do not result in fractional coefficients
Classroom Considerations
  • Learners should already be comfortable with the process of completing the square and imaginary numbers
  • This video is hosted on YouTube
Pros
  • Shows every step and detailed work
Cons
  • The one example shown has fractional coefficients, which may lose some scholars' interest
Common Core